Stool



FIG. 1 is a perspective view of a stool showing our new design;

FIG. 2 is a front view thereof, the back view being identical;

FIG. 3 is a left side view thereof, the right side view being identical;

FIG. 4 is a top view thereof; and,

FIG. 5 is a bottom view thereof.

The broken lines shown in the drawings are included for purposes of illustrating portions of the stool that form no part of the claimed design. 

CLAIM The ornamental design for a stool, as shown and described. 